iac: setup logic to manage credential lease renewals

[noahehall]

C

• we skipped this during the vault integration
• check the vault nomad docs, for infra nomad will handle this
• thus this ticket should likely pertain to just human creds as all apps should go through nomad

T

• add renew lease endpoints to vault.sh
• enhance nodejs logic to run credit check on next tick every so often
  • shouldnt be necessary: with vault >< nomad integration, nomad should manage renewals automatically

A

• renew a token